Why dataflows centralize data preparation in Power BI - Dashboard Impact

Dashboard Mode - Why dataflows centralize data preparation

Business Question

How can centralizing data preparation with dataflows improve consistency and efficiency in reporting?

Sample Data: Sales Records

OrderID	Customer	Region	Product	Quantity	UnitPrice	OrderDate
1001	Alice	East	Widget	10	15	2024-01-10
1002	Bob	West	Gadget	5	20	2024-01-12
1003	Charlie	East	Widget	7	15	2024-01-15
1004	Diana	North	Gizmo	3	25	2024-01-20
1005	Eva	West	Widget	8	15	2024-01-22

Dashboard Components

• KPI Card: Total Sales
  Formula: Total Sales = SUMX(Sales, Sales[Quantity] * Sales[UnitPrice])
  Result: 10*15 + 5*20 + 7*15 + 3*25 + 8*15 = 150 + 100 + 105 + 75 + 120 = 550
• Bar Chart: Sales by Region
  Shows total sales amount per region using the same calculation grouped by Region:
  East: (10*15)+(7*15)=150+105=255
  West: (5*20)+(8*15)=100+120=220
  North: 3*25=75
• Table: Cleaned Sales Data
  Shows data after central preparation in dataflow:
  - Removed duplicates
  - Standardized date format
  - Added calculated column SalesAmount = Quantity * UnitPrice

Dashboard Layout

+----------------------+---------------------+
|      Total Sales      |   Sales by Region   |
|       (KPI Card)      |     (Bar Chart)     |
+----------------------+---------------------+
|              Cleaned Sales Data Table           |
+-------------------------------------------------+

Interactivity

Filter by Region updates the Bar Chart and the Cleaned Sales Data Table to show only selected regions. The Total Sales KPI updates to reflect the sum for the filtered data.

Because dataflows prepare data centrally, all reports and visuals use the same cleaned and consistent data source, ensuring all components update correctly and consistently.

Self Check

If you add a filter for Region = East, which components update and what changes occur?

• Total Sales KPI: Updates to show sales only for East region (255).
• Sales by Region Bar Chart: Shows only East region bar.
• Cleaned Sales Data Table: Displays only rows where Region is East (OrderID 1001 and 1003).

Key Result

Dashboard shows how central data preparation with dataflows ensures consistent sales metrics and visuals across regions.